Telescope air jet



v 1,624,384 Aprll 12, 1927. I F. BEDARD TELESCOPE AIR JET Filed Auzv. 14. 1925 27 Darz ,Hei/"J,

`lz'itented Apr'. 12, 1927. I'

l UNITE-Dj STATES 'PATENT orrics.

` FRANK Banaan; or rLrNr, niente-AN.

TELESCOPE- ATR` EET.

Application fiieaaugust `14., 1925.v seriailNu. 50,249.

the. first press rolls, a certain q uantityof the A.

pulp adheres to the screen belt, because of the fact that the operator cannot separate the paper from the belt, quickly` enough, to start the paper through the pressing rolls, beyond the first ones. This pulp causes a i deterioration of the screen belt, if not reino-ved at once, and to remove the same, the ordinary methods consist in discharging water showers on the lower lap of the belt, and collecting the water and detached pulp in suitable boxes, from whence it escapes to sui-table means. where` it is pumped back into the main supply tank, or chest. A comparatively large amount of this pulp-is lost, through the use of the water showers, and it is the principal object of the present invention to provide means for separating this pulpfrom the wire screen belt, whereby the loss of the pulp is reduced to a minimum.

Another object of the invention is to provide a pneumatic means for separating the pulp from the screen, and wherein the force ofl the air is such that proper and quick separation is accomplished.

Another object is to provide a device of this character wherein the air delivered from the discharge nozzle is of equal force throughout the entire width of the screen belt, thereby insuring the complete separation of the pulp from the screen, with the minimum loss thereof.

Other objects and advantages will be apparent from the following description when taken in connection with the accompanying drawing.

In the: drawing:

Figure 1 is a side elevation of a portion of a lfourdrinicr paper making machine, showing the invention applied thereto.

Figure 2 is a plan view of the air nozzle, a portion of the lower press roll, and screen belt being broken away.

Figure 3 is au enlarged vertical longitun dinal sectional view through the air nozzle. Figure 4 is a vertical transverseA sectional view through the air nozzle.

Referring particularly to the accompanying drawing, 10 represents a portion of the frame of a Fourdrinier. paper machine, on

which are mountedv the upper and lower couch vrolls 11 and 12. Engaged around the lower roll 12, and contacting with thel lower side of the upper roll 11, is the wire screen belt 13),v on which the paper is formed, andi 60 from which the operator' must quickly separate the paper, as the belt passes around the outer sideA of the said lower roll. On each side of the frame 10, below, and inwardly of the lower roll 12, are mounted the brackets 1st, and supported in these brackets, and extending transversely above the lower lap of the screen belt,l is thel air nozzle, represented as al whole by the numeral 15'.

The nozzle includes an outer cylindrical body 16,'eXternally threaded on each end, and having the caps .17' and 18 screwed thereon. ln ther center ofthe cap 17 is an opening 19 through` which is disposed a second cylindrical body 20', smaller diameter 75 than the outer one, and spaced from the inner wall thereof.v This second body or tubey 20 is externallyA threaded on each end and hasthe caps 21 and22k screwed thereon, said tube being of greater length than the tube 16 so that the end which carries the cap 21 projects a certain distance through the cap 17. A third tube 28 is disposed within the `tube 20, and has'one end projecting through the central opening 24, in the cap 21, where S5 it is externally threaded to receive a suitable connection to a supply of air, not shown. The other, or inner, end of the tube 23 is externally threaded and carries the cap 25.

Disposed transversely through all of the 9o caps 17, 21, and 25, and the adjacent ends of the tubes, is a bolt 26, which maintains the tubes against slidable or rotatable movement with respect to each other. In the lower side of the outer tube 16 there is formed a5 a longitudinal slot 27, of a length approximating the distance between the caps 17 and 18. In the second tube 20 there is formed a longitudinal slot 28, of a length equal to the slot 27, but of a width approX- imately twice that of the slot 27. In the innermost tube 23 there is formed a longitudinal slot 29, of a length equal to the other slots but having a width twice that of the slot 29. Thus the slots, range greater in width progressively toward the inner tube, `so that the slot of the outer tube 16 is onefourth that of the slot of the tube 23. Within the caps 17 and 24 are arranged the packing members 30 and 31, respectively, with 110 which the adjacent ends o'li the tubes 1G and il() bear to render an air-tight joint. lt will be noted that the slots are disposed in the respective tubes at points diametrically opposite to the slot of the next adjacent tube, and that the tubes are spaced from each other to form air chambers in which to permit air to collect, so that the air delivered from the external source will not be driven directly through the slots ot' the nozzle, but issue from the outer slot at a uniform pressure throughout the entire length of the slot. lt will be noted that the slot 2T is disposed iu close proximitg7 to the upper 'tace ot' the lower lap ot the screen belt, at a point ad jacent the lower couch roll, so that the air discharged therefrom will pass through the belt, to dislodge the paper .from the screen and blow the same into a suitable receptacle .'32 located therebeneath.

Particular' attention is called to the construction and arrangement of the tubes, and the differences in widths thereof, whereby to cause a constant stream of air to tlow :troni the outer slot 27, and with equal force throughout the entire length of the slot. l `urthermore, the disposition ot the slots, wholly within the space between the caps il? and 18, and the particular spacing ot' the tubes from each other. provides for a series ot air chambers in which the air will col lect under pressure, so that it will issue from the slots with equal force at all points along the slots.

that is claimed is:

l. The combination with the screen belt oit a paper machine, of a device lor projecting air against the screen to remove adhering pulp therefrom comprising telescopicalli7 arranged and spaced chambers haring communication with each other and having an outlet ,tor directing the air against the belt.

Q. rlhe combination with the screen belt ol a paper machine, ot a device for projeeting air against the screen to remove adhering pulp therefrom comprising a series ot telescopic-all37 arranged and spaced tubes, each of the tubes having a longitudinal slot, the slots of the tubes being progressively smaller in width toward the outermost tube.

3. A nozzle for directing air against the screen belt ot a paper making machine comprising a pluralit)T of telescopieally ai ranged and spaced tubes,` said tubes being terminally closed, the innermost tube having connection with a source of air, each of the tubes haring a longitudinally extending slot arranged at a position diametricall)r opposite to the slot oi? each of the other tubes, adjacent thereto, the slot of each tube being ol? greater width than the slot of the next tube therewith, whereby air will accumulate between t-he tubes and issue from the slot ot the outermost tube at a constant pressure throughout the length ol the slot.

FRANK BEDARD. 

